Sweet potatoes are among the healthiest vegetables around -- so long as they don't get doused with butter, marshmallows, or some other high-calorie holiday sabotage. If roasted -- which keeps the flavor very intense without adding fat -- sweet potatoes burst with fiber, vitamin A, potassium, and phytochemicals, which stave off aging, cancer, and arthritis. Plus, they're very filling, so you don't have to overload your plate with them.
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